费托合成水相副产物混合醇渗透蒸发分离工艺  

Study on separation of mixed alcohol from water phase by-product in the F-T synthesis by pervaporation technology

作　　者：李玲[1] 柴士阳 刘来春[1] 黄丹[1] 叶长燊[1] 

机构地区：[1]福州大学石油化工学院,福建福州350116

出　　处：《化工进展》2017年第6期2086-2093,共8页Chemical Industry and Engineering Progress

基　　金：福建省科技厅项目(2014Y0066)

摘　　要：对以钴基催化剂、浆态床工艺为核心的费托合成中试装置产生的水相副产物的分离提纯过程进行了研究,针对目前混合醇多塔精馏回收工艺能耗高的问题,提出了渗透蒸发与精馏耦合的分离提纯工艺。新工艺保留传统多塔精馏回收工艺中的脱水塔和粗分塔,对原工艺中C_1~C_3混合醇-水的分离提纯采用渗透蒸发技术替代传统的精馏技术。研究结果表明:NaA型沸石分子筛渗透膜是混合醇渗透蒸发脱水适宜的膜分离材料,该渗透膜的渗透通量可达2.4 kg/(m^2·h),粗分塔塔顶产品C_1~C_3混合醇-水混合物经过渗透蒸发,混合醇中含水量由17.09%降低到0.5%以下。费托合成水相副产物混合醇经渗透蒸发-精馏耦合工艺可得到含水量低于0.5%的醇产品,与传统多塔精馏回收工艺相比,渗透蒸发-精馏耦合工艺可节能24%,节能效果显著。This article aimed at studying the separation of water phase by-products produced by slurry bed process with cobalt-based catalyst in Fischer-Tropsch synthesis. A separation project about pervaporation and distillation was put forward to instead of the multi-columns distillation technology which was high energy consumption to separate alcohol and water. The new technology remained dehydrating tower and crude distillation tower in multi-columns distillation technology, while C1-C3 alcohol-water mixture was dehydrated by pervaporation technology, replacing the traditional distillation technology. The results showed that NaA zeolite molecular sieve permeable membrane was a suitable material for separation, and the permeation flux can reach 2.4 kg/（m^2·h）. The water content of water phase by-products in Fischer-Tropsch synthesis was reduced from 17.09% to below 0.5% by pervaporation-distillation process. In addition, the energy consumption between pervaporation-distillation process and multi-columns distillation process was compared. It was found that the energy consumption of pervaporation and distillation coupling process can save approximately 24%.

关 键 词：费托合成 醇 渗透蒸发 分离 

分 类 号：TQ028[化学工程]